Malicious PDF — malware analysis report

Static analysis result for SHA-256 438ffe75a8322a1a…

MALICIOUS

PDF

77.1 KB Created: 2021-10-07 05:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a3516a50fe7cef10c7565675e2aeeb5 SHA-1: 830d5515167f13c91d203232382884ab3a722836 SHA-256: 438ffe75a8322a1a3fb6b9cc21938225dcee2a812f162b554ffa4d1435505595
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URLs are embedded within the document, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links, many on disposable domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pgprojekt.pl/Upload/file/berezowabenola.pdf In PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/verakarizileb.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/52663681240.pdfIn PDF document text
    • http://lse.hu/userfiles/file/48400093322.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/daduragabik.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/64389188236.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/82470776606.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/30360174984.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/32819610659.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/95782210135.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/92810404187.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20211004095240.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/lusoridupozidetafug.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/30180553669.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__614E93BEBEF41.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/13647192107.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/44432499487.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/79834969836.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/47502674837.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/raxepevekofujixurevugone.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/wavaxuxogosikijijewisojow.pdfIn PDF document text
    • https://rajaunited.com/contents/files/53064314996.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/xivedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=inner+part+of+seedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 17124 bytes
SHA-256: 5467008a39e2ff37c939657f7de732b7d6eca19c242102e50749488ebe2f4277
font_02_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10304 bytes
SHA-256: 1adc6e730bd6d0c3686aa3d1e0d316585e23ccb0da44722da954adb449de0466

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